I'm trying to learn Jquery from codeacademy.com but i can't get my code to work.

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I'm trying to learn Jquery from codeacademy.com but i can't get my code to work.

It works in the codeacademy.com website but not in my text file. The following html, css and jquery are supposed to make the div boxes shrink and grown when you mouse hover over them. But they dont. Whats wrong with it? I even tried linking the google hosted java thingy (4th line in the html) and it doesn't say to necessarily do that. But even that didn't help.